PM7341 datasheet(74/413 Pages) PMC

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PRELIMINARY

INVERSE MULTIPLEXING OVER ATM

PM7341 S/UNI-IMA-84

DATASHEET

PMC-2000223

ISSUE 4

INVERSE MULTIPLEXING OVER ATM

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE

10.1.2.2

UTOPIA Level 2 Single-Address Slave Mode

In UTOPIA Level 2 Single Address Slave mode, the S/UNI-IMA-84 operates as a

single device with a single large 124 cell FIFO, with all cells being identified by

their virtual PHY ID (VPHY ID) in an address prepend. Each IMA or TC

connection is limited to a maximum of 16 cells in the FIFO. The address prepend

may be optionally mapped to the HEC/UDF field in order to maintain the standard

cell length. When the address presented on the Any-PHY/UTOPIA Interface

RADR pins matches a programmable 5-bit configuration register (DEVID), the

RXAPS will respond to polls. In all other cases, the output signals are tristated

which allows other slave devices to respond. When polled, the RPA output

indicates whether there is at least one cell available for transfer from any link.

10.1.2.3

Any-PHY Slave Mode

In Any-PHY Slave mode, the S/UNI-IMA-84 operates as a single device with a

single large 124 cell FIFO, with all cells being identified by their virtual PHY ID

(VPHY ID) in a address prepend. Each IMA or TC connection is limited to a

maximum of 16 cells in the FIFO. When the address presented on the Any-

PHY/UTOPIA Interface RADR pins matches a programmable 5-bit configuration

signals are tristated which allows other slave devices to respond. When polled,

the RPA output indicates whether there is at least one cell available for transfer

from any link. In Any-PHY mode, data pausing is not supported.

To support current and future ATM Layer devices, the cell interface is

configurable as either an Any-PHY or UTOPIA L2 interface. Table 2 summarizes

the distinctions between the two protocols.

Table 2

UTOPIA L2 and Any-PHY Comparison

Attribute

UTOPIA L2

Any-PHY

Latency

RDAT[15:0], RPRTY, and

RSOP are driven or become

high impedance immediately

upon sampling RENB low or

high, respectively. The RPA

is driven with the cell

availability status one CLK

cycle after the RADR[4:0]

RDAT[15:0], RPRTY, RSOP

and RSX are driven or

become high impedance on

the RCLK rising edge

following the one that

samples RENB low or high,

respectively. The RPA is

driven with the cell

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